deno.land / std@0.166.0 / collections / associate_by_test.ts

associate_by_test.ts
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "../testing/asserts.ts";import { associateBy } from "./associate_by.ts";
function associateByTest<T>( input: [Array<T>, (el: T) => string], expected: { [x: string]: T }, message?: string,) { const actual = associateBy(...input); assertEquals(actual, expected, message);}
Deno.test({ name: "[collections/associateBy] no mutation", fn() { const arrayA = ["Foo", "Bar"]; associateBy(arrayA, (it) => it.charAt(0));
assertEquals(arrayA, ["Foo", "Bar"]); },});
Deno.test({ name: "[collections/associateBy] empty input", fn() { associateByTest( [[], () => "a"], {}, ); },});
Deno.test({ name: "[collections/associateBy] constant key", fn() { associateByTest( [[1, 3, 5, 6], () => "a"], { a: 6 }, ); },});
Deno.test({ name: "[collections/associateBy] empty key", fn() { associateByTest( [ ["Foo", "b"], (it) => it.charAt(1), ], { "o": "Foo", "": "b", }, ); },});
Deno.test({ name: "[collections/associateBy] duplicate keys", fn() { associateByTest( [ ["Anna", "Marija", "Karl", "Arnold", "Martha"], (it) => it.charAt(0), ], { "A": "Arnold", "M": "Martha", "K": "Karl", }, ); associateByTest( [ [1.2, 2, 2.3, 6.3, 6.9, 6], (it) => Math.floor(it).toString(), ], { "1": 1.2, "2": 2.3, "6": 6, }, ); },});
Deno.test({ name: "[collections/associateBy] associates", fn() { associateByTest( [ [ { name: "test", done: false }, { name: "build", done: true }, { name: "deploy", done: false }, { name: "audit", done: true }, ], (it) => it.name, ], { "test": { name: "test", done: false }, "build": { name: "build", done: true }, "deploy": { name: "deploy", done: false }, "audit": { name: "audit", done: true }, }, ); associateByTest( [ [ "anna@example.org", "josh@example.org", "kim@example.org", ], (it) => it.substring(0, it.indexOf("@")), ], { "anna": "anna@example.org", "josh": "josh@example.org", "kim": "kim@example.org", }, ); },});
std
Deno standard library
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Tagged at
2 months ago